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Revert "PM / runtime: Fixup reference counting of device link suppliers at probe"

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Revert commit 1e83786198 (PM / runtime: Fixup reference counting of
device link suppliers at probe), as it has introduced a regression
and the condition it was designed to address should be covered by the
existing code.

Reported-by: Marek Szyprowski <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2018-06-12 10:24:13 +02:00
commit b06c0b2f08
3 changed files with 30 additions and 6 deletions
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3
drivers/base/dd.c
View file

@ -580,7 +580,7 @@ int driver_probe_device(struct device_driver *drv, struct device *dev)
pr_debug("bus: '%s': %s: matched device %s with driver %s\n",
drv->bus->name, __func__, dev_name(dev), drv->name);
pm_runtime_resume_suppliers(dev);
pm_runtime_get_suppliers(dev);
if (dev->parent)
pm_runtime_get_sync(dev->parent);
@ -591,6 +591,7 @@ int driver_probe_device(struct device_driver *drv, struct device *dev)
if (dev->parent)
pm_runtime_put(dev->parent);
pm_runtime_put_suppliers(dev);
return ret;
}

27
drivers/base/power/runtime.c
View file

@ -1563,16 +1563,37 @@ void pm_runtime_clean_up_links(struct device *dev)
}
/**
* pm_runtime_resume_suppliers - Resume supplier devices.
* pm_runtime_get_suppliers - Resume and reference-count supplier devices.
* @dev: Consumer device.
*/
void pm_runtime_resume_suppliers(struct device *dev)
void pm_runtime_get_suppliers(struct device *dev)
{
struct device_link *link;
int idx;
idx = device_links_read_lock();
rpm_get_suppliers(dev);
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node)
if (link->flags & DL_FLAG_PM_RUNTIME)
pm_runtime_get_sync(link->supplier);
device_links_read_unlock(idx);
}
/**
* pm_runtime_put_suppliers - Drop references to supplier devices.
* @dev: Consumer device.
*/
void pm_runtime_put_suppliers(struct device *dev)
{
struct device_link *link;
int idx;
idx = device_links_read_lock();
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node)
if (link->flags & DL_FLAG_PM_RUNTIME)
pm_runtime_put(link->supplier);
device_links_read_unlock(idx);
}